Ceiling – Which way should the joists run for a tray ceiling

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I'm getting ready to frame in a tray ceiling in my closet. The dimensions are 70" x 30".

I was thinking about just using one 2×6 joist that spans the entire length (70") of the trey ceiling right down the middle and then adding two 2×4 nailers along the sides.

Is this the right way to go or would it be better for me to have multiple 2×6 joists that span the shorter width of 30".

There won't be anything too heavy being supported, just 2 light fixtures.

Here's a photo of how I was thinking about doing it:
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Best Answer

If it was me, I'd do 30" joists... they math with less waste out of 8' sticks, and the structure will be more substantial if you walk on it in the attic.

My only hesitation is about the light from above in the picture. Is there a chase for a skylight that you haven't mentioned? If so, design for that, rather than anything else.

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